Read this excerpt from "Heads Up on Sports Safety Which is a key detail that supports the main idea that
there are general principles that guide sports helmet
design?
The dangers to your head depend on the sport, but some
general principles guide helmet design. First, the helmet
needs to be as cool and lightweight and comfortable as
possible Second, the helmet needs to be hard enough
and fit well enough to protect the skull and brain For
some athletes, like hockey goalies or baseball catchers,
the helmet also needs to protect the face from fast pucks
or balls. Third, it must not prevent the wearer from seeing
or hearing Fourth, it cannot cause more injuries than it
prevents
O Helmets must protect the face
O Helmets must not prevent seeing or hearing
O Scientists invent new plastics all the time
O Materials used for police can be used in sports
It turns out that the way to address many of these
concerns is to use hard but flexible, light, strong materials
on the outside and soft materials on the inside. Scientists
create new plastics all the time, but sometimes the best
designs come from using old materials in new ways. One
recent design makes the shell of helmets out of Kevlar,
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